Inertization sweep through purging

Because the majority of permeate samples are collected below atmospheric pressure, transport to the gas chromatograph or alternative analytical devices can be a challenge. This transfer is traditionally achieved by use of either an inert carrier gas or by the vacuum trap method. Transport by an inert carrier gas involves a sweep gas which is allowed to flow through the permeate chamber after sufficient sample has been collected. The product gas is carried to the gas chromatograph. The flow rate of the inert gas must be accurately known for cdculation of gas permeability coefficients (2,3). Further, the gas chromatograph must be purged with the inert gas prior to sample injection (3). 

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